Control Transformers

Control Transformers

MSI Control Transformer

Control transformers are used to step down supply voltages to a lower, safer voltage for control circuits and other low power devices, such as relays, contactors, motor starts, and signaling devices.


  • Power rating up to 5 KVA standard, inquire about higher power options
  • Primary voltage: up to 25 kV class, 125 kV BIL
  • Single or three phase
  • Frequency: 50, 60, and 400 Hz standard, inquire for other frequencies
  • Self-cooled construction



  • Primary and/or secondary fusing
  • Epoxy encapsulation
  • UL Recognized insulation system (Primary voltage must be less than 600V) – 130, 180, and 220°C systems are available
  • CE marking with declaration of conformity ROHS and Low Voltage Directive when applicable
  • Private labeling with customer supplied nameplate artwork – Units that are private labeled cannot carry our UL label
  • Enclosure NEMA 1 or NEMA 3R
  • Test Reports with optional Certificate of Compliance